Pleopeltis angusta Humb. & Bonpl. ex Willd.

Primary tabs

Pleopeltis angusta Humb. & Bonpl. ex Willd.

Descripción

Rhizomes long-creeping, 1.5–2 mm diam.; rhizome scales black with very narrow pale margins, 1.5–2 X 0.5–0.8 mm, comose, margins fimbriate; fronds distant, slightly dimorphic, fertile fronds narrower; stipes castaneous, 1⁄3–3⁄5 the frond length, glabrous, winged almost to base; blades deeply pinnatisect, 4–15(–20) cm wide, with 1–5 pairs of lobes, these opposite to subopposite, linear, ascending, 4–12 cm X 1.5–7 mm; midribs (of rachises and costae) abaxially castaneous to black, prominent usually to blade and pinna apices; veins not readily visible; abaxial blade scales round, 0.3 mm wide, to ovate-lanceolate, 0.8–1 mm long, centers brown, margins denticulate, darker and more dissected around the sori; sori oblong, usually broader than the laminar space, with peltate soral scales 0.5–0.8 mm wide, centers brown-black, margins pale, fimbriate; 2n=68 (Guat), 74 (Oax, Guat), the latter number probably erroneous.A

Forma de crecimiento

Hierba

Forma de vida

EpífitaA

Nutrición

Autotrófica

Distribución

México (país) Nativo y no endémicoA

Elevación

300 – 2800 mA

Tipo de vegetación

Bosque de neblina/mesófilo

Categoría IUCN

No incluidaB

Categoría NOM-059-SEMARNAT-2010

No incluidaC

Estatus del taxón

(A) Como definida actualmente, probablemente una entidad natural (monofilética)

Discusión taxonómica

Brazilian material referred to P. angusta belongs to the related P. pleopeltifolia (Raddi) Alston.
Pleopeltis angusta, the type of the genus, differs from most Mexican species by the pinnatifid blades. In this character, it more closely resembles scaly species here treated in Polypodium. From P. fallax, which has pinnate-pinnatifid blades, P. angusta differs by the much larger fronds, thicker rhizomes, and blackened midribs.

Key to the Mexican Varieties of Pleopeltis angusta
Pinna pairs 1–2; pinnae 4–7 mm wide; Pacific slope.........................var. angusta
Pinna pairs 3–4(–5); pinnae 1.5–5 mm wide; Atlantic slope............var. stenoloma

Pleopeltis angusta var. angusta Humb. & Bonpl. ex Willd., Sp. Pl., ed. 4 [Willdenow] 5: 211. 1810

Differing from var. stenoloma by having 1–2 lateral pinna pairs per blade, pinnae 4–7 mm wide.

Distribution. Epiphytic on Pacific slope; 400–2800 m. Mexico; Guat, Salv, Nic. Lorea-Hernández (in Davidse et al. 1995: 347) also cited this species from Honduras.

Selected Specimens Examined. Chis (Matuda 5423, LL, US). Col (Bautista 16882, GUADA, UC). Dgo (Sánchez S. 724, US). Gro (Hinton 11067, LL, US). Jal (Breedlove 45740, CAS, ENCB). Méx (Tejero-Díez 2547, IZTA). Mich (Rzedowski 39682, ENCB). Nay (Tenorio L. 16802, IEB, MEXU). Oax (Mickel 6172, ENCB, UC; Rzedowski 21318, DS, ENCB, TEX).

Pleopeltis angusta var. stenoloma Farw., Amer. Midl. Naturalist 12: 297. 1931
Drynaria stenoloma Fée, Mém. Foug., 5. Gen. Filic. 272. 1852
Drynaria torulosa Fée, Mém. Foug., 5. Gen. Filic. 271. 1852
Pteropsis angustifolia Fourn., Pl. mex. 1: 86. 1872

Differing from var. angusta by pinna pairs 3–4(–5) per blade, pinnae 1.5–5 mm wide.

Distribution. Epiphytic on Atlantic slope; 300–1700(–2700) m. Mexico; Guat.

Selected Specimens Examined. Chis (Breedlove 56561, CAS, ENCB; Hammel et al. 15681, MO, UC; Martínez S. 18687, TEX). Oax (Mickel 4724, 6377, 7265, ENCB, NY, UC;Wendt et al. 5029, CAS). Ver (Calzada 10305, UC; Purpus 8690, UC, US; Ventura A. 16640, CAS, IEB).

Intermediate specimens between the two varieties with narrow pinnae but few pairs (2–3) occur in Oaxaca: Tehuantepec (Hallberg 1694, 1714, 1739, all NY); along the Tuxtepec-Teotitlán border (Hallberg 1348, NY).
A

Bibliografía

A. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
B. IUCN 2022: The IUCN Red List of Threatened Species. Versión 2022-2
C. SEMARNAT 2019: MODIFICACIÓN del Anexo Normativo III, Lista de especies en riesgo de la Norma Oficial Mexicana NOM-059-SEMARNAT-2010: 101 pp. – https://www.dof.gob.mx/nota_detalle.php?codigo=5578808&fecha=14/11/2019#gsc.tab=0 [accessed 2023-05-04 06:16]